Stationary induction apparatus



E. D. 'TREANOR STATIONARY INDUCTION APPARATUS Dec. 11 .1923

Filed Feb. 5 1920 Inventor: Edward D.Trea-no1-,

His Attorney.

Patented Dec. 11, 1923.

1,477,396 PATENT OFFICE.

UNITED STATES EDWARD D. TREANOR, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

STATIONARY INDUCTION APPARATUS.

Application filed February 3, 1920. Serial No. 356,106.

To all whom it may concern:

Be it known that L'EDWARD D. TREANOR, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new anduseful Improvements in Stationary Induction Apparatus, of which the following is a specification.

My invention relates to stationary induction apparatus and has for its object an improved arrangement of parts which is economical and cheap to manufacture and which improves the electrical characteristics especially of high voltage apparatus.

More particularly my invention relates to transformers, reactors, induction coils and the, like, and hasfor one of its specific objects the provision of a combined casing and lead insulating structure for the high voltage terminals.

In stationary induction apparatus using metallic casings to house the windings and to retain an insulating and cooling medium in contacttherewith it is necessary that the clearances between thewinding and the metallic casing be made sufiicient to provide a safe sparking distance between such winding and the casing. In view of these electrical considerations the casing is often unduly large and bulky so that light and portable apparatus become difiicult to design especially where relatively hi h voltages are involved; lightness an portability being particularly desirable features in induction apparatus designed for service in connection with X-ray tubes.

In the practice of my invention I am enabled to reduce these electrical clearances to a minimum by the novel construction of the casing which I have devised, and have further contrived to form a portion of the casing so that it serves as the bushings for the high voltage terminals.

For a more complete understanding of the nature and objects of my invention reference should be had to the following detailed description taken in connection with the accompanying drawing in which:

Fig. 1 shows a transformer provided with a casing constructed in accordance with my invention.

Fig. 2 shows a modified form.

Fig. 3 shows, in perspective, a detail of fieferring now to Fig. 1, 10 represents a rectangular core structure and on one leg 11 thereof, high and low voltage windings, shown at 12 and 13 respectively, are mounted in concentric relation. The other leg 14 of the core 10 rests on the base 15 of the casing for the transformer. This base 15 is preferably of metal and may be either cast, drawn or spun. The cover for the base 15 comprises the insulating vessel 16, which is made preferably of porcelain, and to which is cemented or otherwise secured,the flanged collar 17. I have shown bolts 18 to secure this collar to the base 15, but it is of course obvious that any suitable securing means may be employed. A gasket 19 is preferably interposed between the cover and base, as shown, in order to make a fluid tight joint where the cover 16 meets the base 15. The cover is preferably filled with some suitable insulating medium as shown at 20, such as oil, pitch, Vaseline, parafline, etc.

The high voltage leads 21, from the winding 12 pass out through the perforated insulating structures or protuberances 22 formed in the crest of the insulating cover, which are clearly shown in Fig. 3. The opening in a protuberance .22, may be bushed as indicated at 23, the whole structure including the lead being sealed in the protuberance in a fluid tight manner. To permit assembly, the bushing 23 may have one enlarged end cemented or threaded into the stem.

The low voltage leads 25 are preferably brought out through openings in the base 15, as indicated; these leads being sealed Iion bushings 26 located in the wall of the ase.

The construction just described makes it particularly feasible, when assembling the parts, to invert the cover 16 and fill it with the insulating medium preparatory to applying the base 15 with the .windings attached. The ultimate sealing of the leads would then be accomplished subsequent to the securing of the base.

In the form shown in Fig, 2 a construetion is disclosed which is particularly adapted to yield a light and portable construction, and where relativel low reactance is not of primary consideration. Here the rectangw lar core 30 has a. low voltage winding 31 surrounding the leg 32, the core and winding in this form of my invention being unenclosed by the insulating casing 33, which l'll serves as a combined housing and bushing tor the high voltage winding 3a.

The insulating casing 33 may be also made of porcelain and comprises two annular members 35 and 36 having upstanding Walls which. are sealed together with a gasket 37 to make the casing fluid tight and adapted to retain the insulating medium 38 in con tact with the winding 3a. The inner Walls of each of these members 35 and 36 are provided with upstanding projections, as at 39, to support the winding and to retain it in properly spaced relation with respect to the casing. The hi h voltage terminals d0 are here also sealed in the insulating structures or protuberances {ll formed in the insulating casing 33.

By the arrangement, which l have just described, l. am enabled to get maximum insu' lating strength with a minimum amount of insulating material. Consequently this arrangement is particularly adapted for designs where a light and portable induction apparatus is required in which the materials of construction are reduced to a minimum.

ln the construction shown in this figure, it is necessary first to assemble the windings and secure together the parts of the casingbefore the core 30 is put in place; the core in such c mated s resent see being; made of interleaved lamarness an embodiment of my invention, I would have it understood that such means are merely illustrative and that l'do not mean to be limited thereby to the exact details shown nor in the choice of recognized equivalents except as defined in my claims hereunto appended. I

What l claim as new and desire to secure by Letters Patent of the United States, is,-

l. ln an electrical apparatus, the combination With inductively related windings of a casing comprising a metallic base portion supporting said windings and an insulating cover therefor having an integral lead insulating structure.

2. ln an electrical apparatus, the combination with inductively related windings of a casing comprising a metallic base portion on which said ,vindings are supported and a combined integral perforated lead insulating structure and cover and terminals :tor said windings secured in the perforations in said cover.

3. ln an electrical apparatus, the combination with inductively related windings,

casing therefor comprising an insulating member provided with a perforated integral insulating protuberanceand a lead from said winding adapted for high voltage service sealed in said protuberance.

witness whereof l have hereunto set my hand this 30th day or: Jan. i920. 

